Abstract: The moisture sensor comprises a block of absorbent material, such as wood. Two opposed faces are coated with conductive material, such as paint and two conductors of a cable are connected to the conductive material. The entire element is encapsulated within a sleeve of electrically insulating material, leaving one end face of the block of moisture absorbent material exposed. A plurality of apertures or perforations are provided in the sleeve exposing at least part of the moisture absorbent material. The sensor is adapted to be exposed to an environment to sense the moisture level of that environment.